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Antarctophthirus Microchir Infestation in Synanthropic South American Sea Lion (Otaria Flavescens) Males Diagnosed by a Novel Non-Invasive Method

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Antarctophthirus Microchir Infestation in Synanthropic South American Sea Lion (Otaria Flavescens) Males Diagnosed by a Novel Non-Invasive Method Parasitology Research (2019) 118:1353–1361 https://doi.org/10.1007/s00436-019-06273-2 ARTHROPODS AND MEDICAL ENTOMOLOGY - ORIGINAL PAPER Antarctophthirus microchir infestation in synanthropic South American sea lion (Otaria flavescens) males diagnosed by a novel non-invasive method David Ebmer1 & Maria José Navarrete2 & Pamela Muñoz2 & Luis Miguel Flores2 & Ulrich Gärtner3 & Anja Taubert1 & Carlos Hermosilla1 Received: 29 December 2018 /Accepted: 18 February 2019 /Published online: 14 March 2019 # The Author(s) 2019 Abstract Antarctophthirus microchir is a sucking louse species belonging to the family Echinophthiriidae and has been reported to parasitize all species of the subfamily Otariinae, the sea lions. Former studies on this ectoparasite mainly required fixation, immobilization, or death of host species and especially examinations of adult male sea lions are still very rare. Between March and May 2018, adult individuals of a unique Burban^ bachelor group of South American sea lions (Otaria flavescens)living directly in the city of Valdivia, Chile, were studied regarding their ectoparasite infestation status. For first time, a non-invasive method in the form of a lice comb screwed on a telescopic rod and grounded with adhesive tape was used for sample taking process. Overall, during combing different stages of A. microchir were detected in 4/5 O. flavescens individuals, especially at the junction between the back and hind flippers. Our findings represent the first report of A. microchir infesting individuals of this synanthropic colony and fulfilling complete life cycle in a sea lion group despite inhabiting freshwater and in absence of females/ pups. Our Btelescopic lice comb apparatus^ offers a new strategy to collect different stages of ectoparasites and a range of epidermal material, such as fur coat hair and superficial skin tissue for a broad spectrum of research fields in wildlife sciences in an unmolested and stress reduced manner. Keywords Echinophthiriidae . Synanthropy . Urban sea lions . Non-invasive sampling Introduction sucking lice (Durden and Musser 1994; Leonardi and Palma 2013), which represents a group of permanent, obligate, and Antarctophthirus microchir isamemberofthefamily wing-free ectoparasitic insects of eutherian mammals Echinophthiriidae belonging to the suborder Anoplura, the exhibiting a hematophagous lifestyle (Kim and Ludwig 1978). Representatives of Echinophthiriidae are of special in- terest since they are the only sucking lice family which infest Section Editor: Boris R. Krasnov host species with semi-aquatic lifestyles, such as Pinnipedia Electronic supplementary material The online version of this article and American river otters (Lontra canadensis)(Murray1976; (https://doi.org/10.1007/s00436-019-06273-2) contains supplementary Kim 1985;LeonardiandPalma2013). The host range of the material, which is available to authorized users. genus Antarctophthirus comprises different pinnipeds includ- ing the families Odobenidae, Otariidae, and Phocidae * David Ebmer (Leonardi and Palma 2013). Compared with the other six [email protected] host-specific members within the genus, A. microchir infests a broader range of host species. Thus, findings on this parasite 1 Institute of Parasitology, Biomedical Research Center Seltersberg were reported from all six species of the otariid subfamily (BFS), Justus Liebig University Giessen, Schubertstr. 81, 35392 Giessen, Germany Otariinae, the sea lions, which show a wide geographical dis- tribution and occur in both hemispheres (Kim et al. 1975; 2 Instituto de Patología Animal, Facultad de Ciencias Veterinarias, Universidad Austral de Chile, Valdivia, Chile Leonardi and Palma 2013; Leonardi et al. 2014). Previous findings reported on A. microchir from free-ranging South 3 Institute of Anatomy and Cell Biology, Justus Liebig University Giessen, Aulweg 123, 35385 Giessen, Germany American sea lion (Otaria flavescens) pups from Argentina 1354 Parasitol Res (2019) 118:1353–1361 and included re-description (Leonardi et al. 2009), morpho- (i.e., hair, dandruffs, epidermal cells/debris, and ectoparasites) logical studies (Leonardi et al. 2012a) and numerous publica- without considerable disturbance. tions on biology (Leonardi et al. 2012b;LeonardiandLazzari 2014), transmission (Leonardi et al. 2013), and population dynamics (Aznar et al. 2009) of this parasite. First description Material and methods of A. microchir parasitizing O. flavescens in Chile was pub- lished in 2008 (Crovetto et al. 2008). Study area The South American sea lion shows a wide geographical occurrence commonly ranging along the Pacific coast of Peru During March and May 2018, an Burban^ bachelor group of and Chile, the Atlantic coast of Southern Brazil, Uruguay, South American sea lions (O. flavescens) was evaluated with- Argentina, and on the Falkland Islands (Vaz-Ferreira 1982). in the Chilean city Valdivia for its ectoparasite infestation These polygynous marine mammals live in distinct social struc- status. The study area comprised different resting spots of this tures including harems or bachelor colonies (Cárdenas-Alayza colony at riverside piers and construction sites (39° 48′ 2017). The Chilean city Valdivia is located approximately 37.566″ S, 73° 14′ 49.289″ W), the local fish market (39° 15 km east of the Pacific Ocean and since the late 1970s this city 48′ 46.84″S, 73° 14′ 54.212″ W), and a swimming platform has been harboring a synanthropic bachelor group of (39° 48′ 46.988″ S, 73° 14′ 55.24″ W), all being located along O. flavescens (Schlatter 1976)—a unique Burban^ colony of or on the freshwater river Calle-Calle within a vicinity of sea lions, which represents the only colony worldwide perma- 4km2. nently living in a freshwater habitat. To date, this sea lion colony is composed of approximately 70 individuals between 2 and Non-invasive combing method 15 years of age which still exchange with the Pacific colonies. Their daily presence at the local fish market, a hot-spot of inter- In order to distinguish single individuals of the colony and to action between humans, sea lions, stray dogs, cats, and birds, create a colony register, animals were observed by eye, indi- leads to a remarkable close contact between sea lions and inhab- vidually photographed (Sony Alpha 5100®, Minato, Japan; itants or domestic pets within the city of Valdivia. At the same Apple iPhone 8 Plus®, Cupertino, USA) and filmed by a time, this close contact enables transmission of different patho- camera drone (DJI Mavic Pro®, Shenzhen, China). For sam- gens. Consistently, a parasitological investigation on the endo- ple collection, a novel non-invasive combing apparatus was parasite fauna of this sea lion colony was carried out and several here designed: a metal-toothed lice comb, fabricated for do- protozoan and metazoan taxa bearing zoonotic potential [i.e., mestic pets (TRIXIE® Heimtierbedarf GmbH & Co. KG, Cryptosporidium, Giardia, Neobalantidium (former Tarp, Germany), bolted on an aluminum telescopic rod fixed Balantidium; Mathison and Pritt 2019), Diphyllobothriidae gen. with tape (TESA®, Norderstedt, Germany), was used for a sp., Anisakidae gen. sp.) were detected (Hermosilla et al. 2016a). broad spectrum of sea lion epidermal material collection In past decades, most investigations on echinophthiriid lice (i.e., fur coat hair, lice, nits, and skin tissue samples). The total required capturing and fixation techniques (Murray and length of Btelescopic lice comb apparatus^ was 1.75 m, the Nicholls 1965;Kim1972;Kim1975;Thompsonetal.1998; metal-teeth row of the comb was 7.5 cm, a single tooth mea- Mehlhorn et al. 2002; Crovetto et al. 2008; Leonardi et al. sured 1.5 cm in length and space between each tooth was 2012b), immobilization applying anesthetic protocols 0.5 mm (Fig. 1). (Murray and Nicholls 1965; Thompson et al. 1998;Dailey et al. 2005; Leonardi et al. 2014, 2016), or even death of Sample collection procedure free-ranging pinniped host species (Scherf 1963;Murrayand Nicholls 1965;Murrayetal.1965;Kim1972 ). Furthermore, For sampling, five non-aggressive sea lions (aged 11 years or several investigations were performed during necropsies of older) were chosen on the basis of trustfulness and individual found carcasses of O. flavescens individuals (Morgades et al. characteristics, i.e., significant skin alterations and apparent 2006; Gomez-Puerta and Gonzales-Viera 2015). pruritus, neoplasia and/or ophthalmic pathologies. When ap- For the first time, the current study delivers data on the proaching the animals, it was of top priority to radiate a sense ectoparasite fauna of the synanthropic colony of of calm and serenity and to maintain direct eye contact with O. flavescens from Valdivia, Chile, by using a self-designed the animals, thereby constantly avoiding frantic movements Btelescopic lice comb apparatus^ for non-invasive lice/nits and loud noises. It appeared beneficial to work from an ele- sample collection. This non-invasive technique is also appli- vated position or at least to stay at eye-level to the sea lions. cable for future monitoring projects on ectoparasite infesta- Depending on acceptance of individuals to humans, an inter- tions of other pinniped species [e.g., harbor seals (Phoca space of at least 0.2–1.5 m was always kept. After selection of vitulina) and gray seals (Halichoerus grypus)] and might serve an individual, firstly the telescopic rod was carefully moved to acquire a wider range of valuable biological skin material into the vision field of the sea lion. Secondly,
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